Sometimes Sims don't turn out to be like what you would expect. ;)
There is a red-haired Secret Society member (a Popular Sim) whose star sign is Leo - because he is a student, his name changes.
My Sim became best friends with him and joined Landgrabb Society. After the initiation, this Sim just grabbed my Sim and made out with her and both fell in love - there had never been any flirting! :)
So I went with the flow and after graduation, he moved in and they married. Because he was a Leo, I expected him to be like Don Lothario and not clean up much, flush toilets or make beds etc and was pleasantly surprised to find this was not true. :)
Nowadays if I play a legacy, I am also more than happy to marry this Sim to one of the female Sims. :)